Regression analysis

This is a forecasting and regression analysis problem that requires the regression analysis to be done to find the slope and intercept. Also adjust the chart to show the Y variables in excel 2007. Please explain that also.

Carpet City wants to develop a means to forecast its carpet sales. The store manager believes that the store's sales are directly related to the number of new housing starts in town. The manager has gathered data from county records on the monthly house construction permits and from store records on the monthly sales.
a. Develop a linear regression model for these data and forecast carpet sales if 30 constructive permits for new homes are filed.
b. Determine the strength of the causal relationship between monthly sales and new home construction by using correlation.